...
Log in to your Twilio Account.
On the console page, go to the Account Info.
...
Create External System Connection
...
Account SID = Twilio account’s Account SID
Active = true/checked
Educational Institution = Account record (from step 3)
External System Connection = Twilio
Token = Twilio account’s Auth Token
...
Set your Twilio Phone Number to the Parameter 1 field in the External System Connection.
...
In your Twilio Account, select which country you would like to send the SMS to.
Twilio Account console page > Messaging > Settings > Geo Permission
...